Two exquisitely clear faceted carbon crystals radiate a mesmerizing array of spectral colors when illuminated directly. Their appearances are nearly indistinguishable, yet one is a…
Simulated diamonds, also called diamond simulants, may look like diamonds, but they don’t have the same chemical, physical and optical properties. Gemologists call these look-alike…
Introduction The pearl is seen as one of the most traditional gems in jewellery. For centuries, it has been used as a precious stone and…